Hydraulic system



J. E. HOLVECK HYDRAULIC SYSTEM Aug. 28, 1928.

'os-Sheet 1 /A/VEA'ZE W. W am/- Filed June 9, 1926 Patented Aug. 28, 1928.

UNITED STATES JOSEPH E. HOLVECK, OF PITTSBURGH, PENNSYLVANI.

HYDRAULIC SYSTEM.

Application filed June 9, 1926. Serial No. 114,675.

This invention relates to hydraulic systems and more particularly to an arrangement for controlling the distribution of a pump discharge to a plurality of points of consumption.

An object of this invention is to provide an arrangement of the type set forth of such construction that the discha-rge from a pump is automatically delivered to a selected point of consumption.

A further object is to provide a device of the type set forth of such construction and arrangement that the place of delivery is automatically changed in accordance with the operation of the system.

A still further object is to provide a hydraulic system of the type described which will be simple in arrangement, reliable in operation and relatively cheap to manufacture.

These and other object-s which will be apparent to those skilled in this particular art are attained by means of this invention, one embodiment of which is illustrated in 'the accompanying drawings, wherein F igure 1 is a more or less diagrammatie view of a hydraulic system constructed in accordanee with one form of this invention showing the adaptation of the same to a Sheet mill. F ig. 2 is a side elevation partly in section on the line 2-2 of Fig. 1. Figs. 3 and 4: are diagrammatic views illustrating the timing of the Operatingr carns and Fig. 5 is a sec tional view of a detail.

The particular embodiment of this invention which has been chosen for the purposes of illustration, includes an ordinary hydraulic pump of any preferred construction which is provided with an unloading mechanism preferably7 but not necessarily, of the form in either of my Patents No. 1.316.794 and No. 1,528,547, granted September 23, 1919, and March 3, 1925, respeotively. A distributor is associated with the discharge line leading from the pump and so arranged that it is capable of direeting the discharge to one or more points of consumption and simultaneously diverting such discharge from other points of consumption associated therewith. Mechanism is employed for so Operating the distributor that the points to which the pump discharge is delivered are continually changed or varied in accordance with the operation of the system and such mechanism is preferably, as illustrated, as-

sociated with and operated by the pump loadinv and unloading mechanism.

As i lustrated, the present embodiment of the invention is shown in connection with a hyd'raulic pump 5 of any preferred construction suci as the triple cylinder device illustrated in Figs. 1 and 2, each cylinder of which is provided with an exhaust or outlet valve 6 and an inlet or suction valve 7. A valve rod 8 extends outwa-rdly through an associated packing 9 and the lower end of each rod is supported upon an adjacent end of a rocker arm 10, the opposite end of which is pivotally mounted upon an arm supporting rod 11 extending between supporting brackets 12. Each rocker arm has a roller or cam follower 13 engaging cams lt secured to a cam shaft 15 which may convemently be supported on the pump base. Each cam is provided with diametrically opposed high portions 16, each of which extend for ninety degrees of the cam circumference, and intermediate low portions 17 also extending for ninety degrees of the cam circumference on each side thereof between the high portions 16.

Itl will be apparent that rotation of the cam shaft 15 to a given position will lift the rocker arms 10 so as to raise the associated valve rods 8 and hold the suction valves 7 away from their seats, thus unloading the pump and preventing any discharge thereof. It will also be apparent that a further rotation of the cam shaft to such a lposition that the rollers 13 are in the low portions 17 of the associated cams will pcrmit the valve rods 8 to drop, allowing the associated valves to seat and thus load the pump.

The cranl: shaft 18 of the pump is provided with a crank arm 19 secured to a connecting rod 20, the opposite end of which operates an oscillatory driving` clutch member 21, loosely supported upon an extension of the cam shaft 15. The cam shaft 15 is hollowed adjacent the clutch and is provided with diametrically opposed, longitudinally extending slots 15'. A driven clutch member 22 is feathered to the cam shaft for sliding movement and secured to a slidable clutch Operating rod 22' by a pin 23 extending through the slots 15'. The clutch member has two diametrically opposed clutch teeth 23' so formed tlfereon that engagement of the clutch member with the oseillating clutch member` 20 will rotate the cam shaft in one direction only.

A slidable clutch member 24 is similarly feathered to the cam shaft and secured to the slidable operating rod on the opposite side of the oscillating clutch member 21 from the clutch 22 and the opposed clutch member 24 is provided with two diametrically opposed teeth 25 which are so formed thereon that engagement with the Operating teeth 2G of the oscillating clutch member 20 will rotate the shaft through a ninety degree angle in the sameV direction as caused by engagement of the 'oscillating clutch 20 with the clutch member 22. The teeth 23' of one clutch member are offset with relation to the teeth 25 of the other clutch member ninety deg'i'ees. The sldable clutch members 22 and 25 are ada'liited to be alternately s'hifted into and out of engagement with the oscillating clutch member 20 by means of a solenoid 27 having a core '28 provided with a weight 29 and pivoted to one arm of a bell cranklever 30, lthe other 'ar'm of which is received between collars 31 formed on the proj'eeting end of the'clutch shifting rod 22', for the purpose of shifting'the 'slidable clutch members 22 and 24' into and 'out of engagement with the'oscillating clutch member 20. i

It will be apparent that closing the cireuit of the solenoid 'will raise the core 28 so as to shift the clutch rod andslidable'clutch members tov the left in Figi. Such movement bi'ings one of the teeth 23' into engagement with' the ltooth' 26 'of the os'cillatory member 21 and the cam shaft 15 is rotated ninety degrees or to a position wherein the cam rollers 13 of the rocker arins are lowered by contact with the low portions of the associated cams The pump Will then be loaded. Breaking the solenoid circuit permits the core 28 to drop under the influence of the weight 29 and shifts the slidable clutch members to the right so as to bringV one of the teeth 25 of the member 24 into engagement with the associated tooth 26 of the osci'll'a'tory member 20. The cam shaft is thus again rotated through an are of ninety degrees, and it will be apparent from Fig. 4 that such rotation will move each cam into such a position that the associated rollers 13 will be elevated by the high portions of the associated cams, as shown diagrammatically in Fic'. 4, and the pump will then be unloaded and no discharge takes place.

Mechanism is provided for directing the. discharge of the pump deli'vered through the discharge pipe 32 to one or more selected points of delivery or consumption out of several such points. As illustrated, this niechanism includes a di'stributor 33 having ain inlet mani'fold 34 and separate outlet manifolds 35 and 36 leadinto separate delivery lines 87 and 38, respec ively. Valves 39 are adapted to open and close` the passages between the inlet manifold 34 of the distributor and the various outlet manifolds. A valve rod 40 is associated with each valve and, like the valve rods 8 of the pump, are supported on rocker arms 41 pivotally mounted on a rocker arm supporting rod 42 and each rocker arm is adaptcd to be raised and lowered by an associated cam 43, as diagrammatically illustrated in Fig. 3. Each of the distributor valve Operating cams 43 has a high portion 44 exte'nding substantially one hundred and eighty degrees around the cam circum ference and a lower portion extcnding the rcmaining one hundred and eighty degrees around the cam circumference.

The cams 43 are supported upon an extending end of the cam shaft 15 and are so formed thereon that when one cam is oostioned so as to raise the associated valve rod 40 and open the associated passage between the nlet manifold 34 of the distributor and the outlet 38, the other cam will be so positioned that the associated valve rod 40 will be lowered and the associated valve 39 will close the pass-age between the inlet manifold 34 and the other discharge line 87.

As illustrated, the invention is shown as adapted to deliver water to one of two sets of nozzles for the purpose of l'lushing` scale off hot Sheet bars. One set of nozzles 44 are supplied by the discharge line 38 and the other set 45 is fed by the line 37. A switch 46 is connected in the solenoid circuit 47 and so positioned as to be automatically operated by entrance of a Sheet bar 48 between the nozzles 44. A second switch 49 is connected in the solenoid Circuit 47 and in parallel with the first switch 46. The second switch 49 is positioned so as to be 'automatically operated by passage of a sheet bar through the second set of nozzles 45.

Assuming a sheet bar 48 to bc just entering the space between the first set of nozzlcs 4-4, it will be apparent that the resulting closing of the switch 4G will actuatc the solcnoids So as to raise the core 28 and shift the slidable clutch member 22 into engagement with the oscillatin'g clutch member 20. The cam shaft 15 will be rotated so as to pcrmit loadi'ng of the pump, that is to say, pci-mit the rocker arms 10 to be lowered and enable the suction valves to close. This rotation of the cam shaft has also rotatcd the distributor valve Operating cams 43 to such a position that the valve associated with the delivery line 38 will be opcn'to enable water to flow to the nozzles 44 adjacent the switch 46 which has just been ac'tuatcd. The distributor valve associated with the delivery line 37 will bc closed and no water will flow to the `nozzl'cs 45. After the sh'eet bar has passed through the ,fi'rst set of nozzles 44 the automatic switch 4G will be opened, the solenoid de-cnergized and vthe slidable clutches shi'fted to the 'right by means of the Weight 29. The clutch 24 will then engage the clutch 20 and the cam shaft will be again rotated through an angle of ninety dcgrees. This unloads the pump and no furthcr delivery takes place. When the sheet bar in its progress reaches the automatic switch 49, the latter will be closed and the solenoid again energized, again moving the clutch 22 into engagement with the clutch :20 and again rotating the cam shaft so as to perinit the pump to load. This second rotation of the cam shaft now causes the cams 43 to be so positioned that the valve 39 associated with the supply line 38 will be closed while the other distributing valve associated with the supply line 37, leading to the nozzles 45 adjacent the switch 49 which has just been operated, will be open to permit water to fiow through the distributor to the latter nozzles. After the sheet bar passes the switch 49 it is automatically opened, the solenoid is aga-in de-energized, the clutch member 24 engages the clutch 40 and the cam shaft is again rotated to a position where the pump will again be unloaded.

A push button 50 is I ositioned in the solenoid circuit and may lie employed in place of the automatically operated switches or as an auxiliary switch for advancing the operation of the solenoid with relation to the work being done.

One cycle follows the other and rotation of the cam shaft occurs in one direction only through angles of ninety degrees at a time.

Obviously, the distributor cams 43, instead of being directly connected to the leading mechanism, may be driven through intermediate gearing or the like. Such an arrangement will, of course, be cssential when more than two points of delivery are associated with the apparatus.

It will be apparent that the present invention can be applied to the operation of many devices other than sheet mills, and, although I have described a particular arrangement of the present invention and the application thereof to a specific use, various modifications applied to the same or other uses can be made therein without departing from the spirit of the invention or the scope of the appended claims.

l/Vhat I claim as new and desire to secure by Letters Patent is:

1. The combination in a hydraulic system of a pump, a distributor for directing the pump discharge to a selected delivery point and means operated by said pump for operating said distributor to vary the point of delivery.

2. The combination With a pump of a distributor for directing the discharge thereof to a selected point and mechanism for loading and unloading said pump and for operating said distributor simultaneously therewith.

3. The combination with a pump of a distributor for directing the discharge thereof to a selected point and mechanisn'i for operating said iflistributor in accordance with the loading and unloading of said pum 4. The combination with a pump o' a distributor for directing the discharge thereof to a selected point and means including a. magnetic control adapted to be operated by an external object for loading and unloading said pump and Operating said distributor in synchronism thcrewith.

5. The combination with a pump of a plurality of delivery outlets, a. distributor for directing the discharge of said pump to selected outlets` mechanism for loading and unloading said pump and pump driven means for Operating said distributor so to direct the discharge of said pump to successively different outlets upon each successive leading operation.

6. The combination with a pump of a plurality of delivery outlets, a discharge control valve for directing the pump discharge to selected outlets and means for Operating said valve from said pumpY 7. The combination in a hydraulic system of a pump, mechanism for loading and unloading said pump, a distributor connected to the pump outlet, a plurality of discharge lines leading from said distributor, means for' separately controlling each of said discharge lines and mechanism operated by said loading mechanism for Operating said controlling means so as to direct the pump discharge through different lines with each successive loading operation.

8. The combination in a hydraulic system of a pump, mechanism for loading and unloading said pump, a distributor rovided with an inlet manifold connectedp to the pump Outlet, separate discharge manifolds communicating with a plurality of discharge lines, a valve for separately controlling the fiow through each of said discharge manifolds and means operated by said loading mechanism for Operating said valves so as to direct the pump discharge to different lines With each successive loading operation.

9. The combination in a hydraulic system of a pump, mechanism including a cam shaft for loading and unloading said pump, a distributor provided With an inlet manifold communicating with said pump Outlet, separate discharge manifolds leading to a plurality of discharge lines, a valve associated With each of said discharge manifolds and a cam associated With each of said valves and secured to said shaft for Operating said valves so as to direct the pump discharge through a different discharge line with each successive leading operation.

10. The combination in a hydraulic system of a pump, mechanism including a solenoid for leading and unloading said pump,

a plurality of discharge lines connected to the pump outlet and leading to a plurality of points of consumption, means associated with each point of consumption for controlling the operation of said solenoid and said loading mechanism and a distributor for directing the pump discharge through a selected line.

11. The combination in a hydraulic system of a pump, mechanism for loading and unloading said pump including a plurality of rocker arms associated with the suction valves of said pump, a cam for Operating each of said rocker arms, a shaft on which said cams are secured, an oscillatory clutch member supported on said shaft, means for driving said clutch member from said pump, associated clutch members adapted to be alternately engaged by said oscillating member for rotating said shaft, a solenoid for Shifting said associated clutch members, a plurality of discharge lines connected to the pump outlet and means associated with each discharge line for causing the operation of said solenoid and a distributor for directing the pump discharge through a selected line.

12. The combination With a pump of a plurality of conneetions leading to different points of delivery,` a distributor for directing the pump discharge through a selected connection, mechanism actuated by a movable part of said pump for Operating said distributor and means for controlling the operation of said mechanism.

13. The combination in a hydraulic system of a pump, a plurality of connections leading to different points of delivery, a distributor for directing the pump discharge through a selected connection and magnetieally operated mechanism for controlling the operation of said distributor from a remote point.

14. The combination in a hydraulic system of a pump, a plurality of connections leading to different points of delivery, a distributor for drecting the pump dischargc through a selected connection including means for separately controlling each of said eonnections, means driven by said pump for Operating said distributor and magnetieally operated mechanism for controlling said pump driven means.

15. The combination in a hydraulic system of a. pump, meehanism for loading and unloading said pump, a distributor provided with an inlet manifold connected to the pump Outlet, separate discharge manifolds communicating with a plurality of discharge lines, valves for separately controlling the flow through each of said discharge manifolds and means for Operating said valvcs so as to direct the pump discharge to a selected line.

16. The combination with a pump, of mechanism for leading and unloading said pump including a shaft provided with valve lifting members, mechanism for rotating said shaft so as to intermittently load and unload said pump and means for controlling the operation of said mechanism.

17. The combination with a pump having a valve, of mechanisin for loading and unloading said pump including a cam for raising and lowcring said. valve, meehanism driven by the pump for rotating said shaft and means for controlling the operation of said shaft rotating mechanism.

18. The combination with a pump, of mechanism for leading and unloading said pump including a rotary shaft, means for operating said shaft, a clutch for connccting said shaft to said Operating means for part of a revolution so as to load and unload said pump and means for Operating said clutch.

19. The combination with a pump, of mechanism for loading and unloading said pump, including a rotary shaft, means for Operating said shaft, a clutch for connecting said shaft to said Operating means for part of a revolution so as to load and unload said pump and electromagnetic means for Operating said clutch.

20. The combination with a pump, of mechanism for loading and unloading` said pump including a rotary shaft, means for Operating said shaft, a clutch for connecting said shaft to said Operating means for part of a revolution so as to load and unload said pump, a solenoid for Operating said clutch and means for controlling the operat'ion of said solenoid.

In testimony whereof, I have hereunto subscribed my name this 5th day of June,

JOSEPH E. HOLVECK. 

